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High-strength and high-conductivity dispersion-strengthened alloy and preparation method thereof

A dispersion-strengthened copper and dispersion-strengthened technology is applied in the preparation of high-strength and high-conductivity dispersion-strengthened copper alloys, and in the field of high-strength and high-conductivity dispersion-strengthened copper alloys. To achieve the effect of improving mechanical and electrical conductivity

Inactive Publication Date: 2011-01-26
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005]However, there is a big defect in the method of mechanical alloying or the combination of mechanical alloying and internal oxidation, that is, the ceramic reinforcing phase will Preferentially attached to those undissolved ceramic particles for nuclei growth, which easily leads to the coarsening of the ceramic reinforcement phase and reduces the dispersion of ceramic particles
[0006]In addition, due to the poor electrical conductivity of ceramics, when ceramics are used as a dispersion-strengthened copper reinforcement phase, the electrical conductivity of the dispersion-strengthened copper alloy will inevitably be reduced
The basic principle that the ceramic reinforcement phase affects the conductivity of the alloy is: copper and ceramics have different thermal expansion coefficients, and the internal stress caused by the difference in thermal expansion coefficient will lead to lattice distortion, which will increase the dislocation density around the ceramic dispersed phase. Ceramic particles themselves have poor conductivity, making electrons easy to scatter at the copper-ceramic interface during transmission, thereby reducing the conductivity of the material
Therefore, the traditional method of improving the preparation process of dispersion-strengthened copper cannot fundamentally change the problem that ceramic-reinforced particles reduce the conductivity of dispersion-strengthened copper alloys.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The composition of the high-strength and high-conductivity dispersion-strengthened copper alloy prepared in this example is: Cu-1.18wt.%Y 2 o 3 -0.42wt.%Ag-0.21wt.%Hf, the specific process and steps are as follows:

[0031] Using the water mist method, prepare Cu-Y alloy powder (average particle size is 53 microns) according to the mass ratio of Cu-1.0wt.%Y, and prepare Cu-Ag- Hf alloy powder (average particle size 53 microns). Take Cu-Y alloy powder 200g and Cu 2O powder (average particle size of 0.5 microns) 6g, after simple mechanical mixing, the powder is subjected to high-energy ball milling to oxidize metal Y to Y 2 o 3 Ceramic reinforcement phase. The ball milling tank used in the ball mill is a stainless steel vacuum tank lined with zirconia, the ball milling medium is zirconia balls, the ball-to-material ratio is 15:1, and the zirconia balls are mixed balls with particle sizes of 5mm, 10mm and 15mm. The ratio from small to large is 2:5:3. The protective...

Embodiment 2

[0037] The composition of the high-strength and high-conductivity dispersion-strengthened copper alloy prepared in this example is: Cu-1.0wt.%ZrO 2 -0.35wt.%Ni-0.2wt.%Y, the specific process and steps are as follows:

[0038] In a vacuum glove box protected by Ar, Cu powder, ZrO 2 Powder, Ni powder and Y powder are prepared according to the above mass percentages, of which ZrO 2 The average particle size of Cu powder, Ni powder and Y powder is 75 microns. Put the prepared dispersion-strengthened copper powder into a stainless steel vacuum tank lined with zirconia, and add stearic acid coupling agent into the ball mill tank. The mass ratio of stearic acid to the dispersion-strengthened copper powder is 1.0wt.%. Add zirconia balls into the ball mill tank at a ball-to-material ratio of 15:1, wherein the zirconia balls are mixed balls with particle sizes of 5mm, 10mm and 15mm, and the proportions are 2:5:3 from small to large. The ball milling jar was sealed and vacuumized for...

Embodiment 3

[0043] The composition of the high-strength and high-conductivity dispersion-strengthened copper alloy prepared in this example is: Cu-0.8wt.%TiB 2 -0.2wt.%Ni-0.3wt.%Zr, the specific process and steps are as follows:

[0044] In a vacuum glove box protected by Ar, Cu powder, TiB 2 Powder, Ni powder and Zr powder are prepared according to the above mass percentage, wherein TiB 2 The average particle size of Cu powder, Ni powder and Zr powder is 75 microns. Put the prepared dispersion-strengthened copper powder into a stainless steel vacuum tank lined with zirconia, and add stearic acid coupling agent into the ball mill tank. The mass ratio of stearic acid to the dispersion-strengthened copper powder is 1.0wt.%. Add zirconia balls into the ball mill tank at a ball-to-material ratio of 15:1, wherein the zirconia balls are mixed balls with particle sizes of 5mm, 10mm and 15mm, and the proportions are 2:5:3 from small to large. The ball milling jar was sealed and evacuated for ...

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Abstract

The invention relates to a high-strength and high-conductivity dispersion-strengthened alloy, which comprises a copper base, a ceramic dispersion-strengthening phase and a doping element, wherein the ceramic dispersion-strengthening phase may be one or several of ZrO2, Y2O3, MgO, Al2O3 and TiB2 which accounts for 0.1 to 2 mass percent of the copper alloy; and the doping element may be one or several of Ni, Y, Ag, Ti, Zr and Hf which accounts for 0.1 to 1 percent of the copper alloy. In the invention, the problems of ceramic particle agglomeration caused by low bonding performance of the copper and ceramic interface, the roughening of the ceramic particles in sintering and material conductivity reduction caused by the scattering of electrons at the copper and ceramic interface are solved, and the dispersion-strengthened alloy with higher hardness and higher conductivity is obtained. The invention also relates to a preparation method of the high-strength and high-conductivity dispersion-strengthened alloy.

Description

technical field [0001] The invention relates to a copper-based nonferrous alloy, in particular to a high-strength and high-conductivity dispersion-strengthened copper alloy. The invention also relates to a preparation method of the high-strength and high-conductivity dispersion-strengthened copper alloy. Background technique [0002] Dispersion-strengthened copper (DSC) is a high-performance functional material with excellent mechanical properties and good electrical and thermal conductivity. As an important functional material, dispersion-strengthened copper has been widely used in industrial fields such as automobiles, welding electrodes, lead frames, and microwave devices. By adding a small amount of second-phase particles, the dispersion-strengthened copper improves the mechanical strength of the copper alloy while maintaining its good electrical and thermal conductivity. The essence of dispersion strengthening is to use uniformly dispersed ultra-fine particles to hin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/00C22C1/05
Inventor 刘绍军肖勇
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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